Discrete Grab Samples
The Operations and Maintenance (O&M) field divisions maintain more than 30 standard discrete, or grab, sampling stations along the SWP. These sampling sites are routinely monitored for over 200 chemicals according to the sampling schedule. Results of the water quality monitoring are found in DWR's Water Data Library.
O&M Water Quality Section staff prepare monthly summary reports of grab sample chemicals at key SWP locations. View the most recent grab sample report grab sample table.
Pesticide data for key SWP locations are generally available for the months of March, June, and September. Water Quality Section staff prepare pesticide tables summarizing data on detected pesticides concentrations. View the most recent pesticide data table.